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  1. #1
    Gear Head 80vette's Avatar
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    Ultegra 9 speed triple to double FD issue

    I just converted my Utlegra triple to a compact double.
    I change the FD to a double .

    When I installed the cable I on the FD I went to the full slack position then installed.

    Now what was my trim position is there when I shift to the big ring.

    Let me say it another way.

    Starting in the small ring.. when I shift to the large ring I have to trim the FD to stop the rub.

    How do I adjust this out.
    Do I start with the shifter in a different position then cable up the FD?

    Other thoughts?
    07' Colnago CLX
    03' KHS XC304
    79' Schwinn Super LeTour - 27 lbs

  2. #2
    Senior Member
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    Did you replace the bottom bracket to the double version (shorter spindle)?
    If you have then I would start by checking the high side limit screw, actually both limit screws.
    Then check the cable tension.
    You started in the correct position, cable all the way out. Most Shimano shifters are double/triple compatible. You can expect to have more positions than you need.

    Al

  3. #3
    Gear Head 80vette's Avatar
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    Yes forgot to mention that I did replace the bottom bracket.
    Yes I have adjusted the limit screws ... no problem with the chain going to far either way.

    I just have the "trim" issue.
    07' Colnago CLX
    03' KHS XC304
    79' Schwinn Super LeTour - 27 lbs

  4. #4
    Senior Member
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    Quote Originally Posted by 80vette
    Yes forgot to mention that I did replace the bottom bracket.
    Yes I have adjusted the limit screws ... no problem with the chain going to far either way.

    I just have the "trim" issue.
    Are we talking about the chain rubbing against the front derailleur when on the big ring?
    if so which cog(s) is the chain on when this happens?
    Sometimes a re-alignment of the derailleur can fix this.
    I'm thinking you really shouldn't have chainrub on the derailleur when on the big ring unless you are cross-chained to the biggest cassette cog.

    Compact doubles often have chainrub on the side of the big ring with the chain running on the inner chainirng and smaller cogs, especially if the inner ring is a 34. This can be partially corrected with a bottom bracket spacer.

  5. #5
    Senior Member Retro Grouch's Avatar
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    It sounds to me like you have a cable tension adjustment issue. When you get your front derailleur dialed in, you should have a trim position for each front chainring. It might take a couple of tries to get it perfect.

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